Doff, A., & Jones, C. (1999). Language in use: Beginner : self-study workbook with answer key [Băng Casset]. Cambridge: Cambridge U. P..
استشهاد بنمط شيكاغوDoff, Adrian, و Christopher Jones. Language in Use: Beginner : Self-study Workbook With Answer Key [Băng Casset]. Cambridge: Cambridge U. P., 1999.
MLA استشهادDoff, Adrian, و Christopher Jones. Language in Use: Beginner : Self-study Workbook With Answer Key [Băng Casset]. Cambridge: Cambridge U. P., 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.